Manual Overriding Of Operating Mode (Contact H1); Pump Overrun - Siemens RVL481 Basic Documentation

Siemens
Building Technologies
The display shows the fault status message with
on operating line 50 under error code 120.
The flow alarm can be deactivated by entering --:--.
T
V
w
t
A
t Time
t Start of fault display
1
t End of fault display
2
t Waiting time (set on operating line 171)
A
TV Flow temperature
w Setpoint
x Actual value
Y Setpoint band
• At t
, error message is triggered; during the period of time t
1
171), the actual value stayed below the setpoint band y
• At t
, the error message is reset; the actual value "x" has reached the setpoint band "y"
2

25.4.3 Manual overriding of operating mode (contact H1)

Using a simple remote operation facility, the operating mode of the heating circuit and
that of d.h.w. can be overridden. This is accomplished by bridging terminals H1 − M.
It is possible to select the operating mode to be used when H1 − M are bridged:
Setting Operating mode heating circuit
0
1
2
3
4
5
6
7
8
9
As long as this function is active, the LED of the respective operating mode button
flashes at a low frequency (approx. 0.5 Hz). The buttons themselves are however inop-
erable.
Once this function is deactivated, the RVL481 will resume the operating mode previ-
ously selected.
With plant types 4–x, 5–x, and 6–x, contact H1 only acts on the d.h.w. circuit.

25.4.4 Pump overrun

To prevent heat from building up, a common pump overrun time can be set for all
pumps associated with the controller (with the exception of the circulating pump) on
operating line 174. In that case, the pumps will overrun for the overrun time set, or the
changeover valve will maintain the charging position during that period of time.
Heating and D.h.w. Controller RVL481
25 Function block "Service functions and general settings"
y
x
t
A
t t
1
Operating mode d.h.w.
Protection OFF
AUTO OFF
REDUCED OFF
NORMAL OFF
Protection ON
AUTO ON
REDUCED ON
NORMAL ON
AUTO ON (24 hours a day)
NORMAL ON (24 hours a day)
. More detailed information is given
t
A
t
2
(set on operating line
A
87/118
CE1P2541en
20.05.2008